No time to test this right now but there are a couple of problems I can spot.
1. This deck doesn't use much
![Gravity :gravity](https://elementscommunity.org/forum/Smileys/solosmileys/../../../images/Misc/gravity18x18.png)
, meaning that the quanta generated by your mark is partly wasted. I think it would be better to either change the mark and drop Unstoppable, or take more cards from
![Gravity :gravity](https://elementscommunity.org/forum/Smileys/solosmileys/../../../images/Misc/gravity18x18.png)
. That would make the deck more efficient.
2. Like many have said, and you also say in your original post, this deck is highly combo-dependent which can be a bit of a problem at times.
Other than that, it looks good to me.